Influenza (flu) epidemics affect 20% of the U.S. population annually, and researchers estimate direct medical costs to the U.S. are $10.4 billion with a further $16.3 billion in lost earnings due to illness (2005 estimate). This flu season portends to be particularly challenging because the H1N1 version of the virus (the swine flu) has been active throughout the summer, and could become widespread as the flu season comes to the northern hemisphere. The regional economic downturn complicates the flu season further, as families and business have a smaller cushion to deal with the impact from lost productivity/earnings. The CDC stresses the development of continuity and crisis plans for all businesses.